cmd.dc

Object-Oriented Programming With ANSI-C这本书中的源代码!找了很久

% Cmd flag {
	const char * value;
%casts
	assert((flagM) flag == flag);

	switch (flg) {
	case 'f':
		puts("-f");
		break;
	case 'v':
		if ((value = argval(filter)))
			printf("-v \"%s\"\n", value);
		else
			puts("-v NULL");
		break;
	default:
		fprintf(stderr, "%s: unknown flag '%c'\n",
			progname(filter), flg);
	}
}

% Cmd name {
%casts
	assert((nameM) name == name);

	if (arg)
		printf("name \"%s\"\n", arg);
	else
		puts("name NULL");
	return 0;
}

%init

int main (int argc, char * argv [])
{	void * filter = new(Filter(), new(Cmd()));

	return mainLoop(filter, argv);
}